KR102560233B1 - Organic light emitting display apparatus - Google Patents

Abstract

An object of the present invention is to provide an organic light emitting display device capable of determining whether a data driver IC generating sensing data for compensation or a sensing data transmission line between the data driver IC and a control unit is defective by using a lock signal to determine whether image data is normally received by the data driver IC.

Description

Organic light emitting display {ORGANIC LIGHT EMITTING DISPLAY APPARATUS}

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device in which characteristics of a driving transistor are sensed through a sensing line.

In a conventional organic light emitting display device, variation in characteristics such as a threshold voltage (Vth) or mobility of a driving transistor occurs for each pixel due to process variation, deterioration, and the like. Therefore, the amount of current driving each organic light emitting diode is different, and as a result, a luminance deviation occurs between pixels.

In order to solve the above problem, various types of compensation methods are used in organic light emitting display devices that sense threshold voltage or mobility of a driving transistor and compensate input image data according to the sensed value.

In order to apply the compensation method, an organic light emitting display panel is generally provided with sensing lines, and voltage values received through the sensing lines are converted into digital values by an analog-to-digital converter of a data driver integrated circuit (IC) (hereinafter simply referred to as IC) and transmitted to the control unit. The controller determines the amount of change in the threshold voltage or mobility using the digital values, that is, sensing data for compensation.

However, if a defect occurs in a sensing data transmission line through which the sensing data for compensation is transmitted or a defect occurs in the digital converter, abnormal sensing data for compensation are received by the controller, and thus, the amount of change in threshold voltage or mobility may not be accurately determined.

An object of the present invention proposed to solve the above problems is to provide an organic light emitting display device capable of determining whether a data driver IC generating sensing data for compensation or a sensing data transmission line between the data driver IC and a control unit is defective by using a lock signal to determine whether image data is normally received by the data driver IC.

An organic light emitting display device according to the present invention for achieving the above technical problem is an organic light emitting display panel having pixels including organic light emitting diodes and sensing lines connected to the pixels, a data driver including first to n th data driver ICs that convert sensing values received from the sensing lines into sensing data and outputs the sensing data, transmits test image data to the data driver ICs using an embedded clock point-to-point interface protocol, and analyzes the sensing data to either the data driver ICs or the sensing data It includes a control unit for determining whether the sensing data transmission lines received are normal and a power supply unit for supplying power. Here, the control unit transmits a lock control signal having a value corresponding to 0 or 1 to each of the data driver ICs according to the result of the normality determination, and the power supply unit transmits a 0th lock sensing signal to the first driver IC. In addition, the data driver generates a lock sensing result signal indicating whether the data driver ICs or sensing data transmission lines through which the sensing data is received are normal, using the lock control signal and the zeroth lock sensing signal, and transmits the signal to the power supply unit.

According to the present invention, it is possible to determine whether a data driver IC generating sensing data for compensation or a sensing data transmission line between the data driver IC and the control unit is defective without adding lines.

In addition, according to the present invention, when an error occurs in a lock signal, an error signal according to a failure of the data driver IC or the sensing data transmission line can be transmitted through a path through which the error signal is transmitted to an external system. Accordingly, there is no need to add a separate component or transmission line to transmit an error signal due to a failure of the data driver IC or the sensing data transmission line.

1 is an exemplary view showing the configuration of an organic light emitting display device according to the present invention.
2 is an exemplary view showing the configuration of a pixel applied to an organic light emitting display device according to the present invention;
3 is an exemplary view showing the configuration of a control unit applied to an organic light emitting display device according to the present invention;
4 is an exemplary view showing the configuration of a data driver IC applied to an organic light emitting display device according to the present invention;
FIG. 5 is an exemplary diagram illustrating configurations of a data power supply unit and a sensing unit shown in FIG. 4;
6 is an exemplary view showing the configuration of the lock processing unit shown in FIG. 4;
7 is a flowchart illustrating an embodiment of a method of driving an organic light emitting display device according to the present invention.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments make the disclosure of the present invention complete, and those skilled in the art are provided to fully inform the scope of the invention, and the present invention is only defined by the scope of the claims.

In this specification, it should be noted that in adding reference numerals to components of each drawing, the same components have the same numbers as much as possible, even if they are displayed on different drawings.

Since the shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining the embodiment of the present invention are exemplary, the present invention is not limited to the matters shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, when the positional relationship of two parts is described as 'on ~', 'upon ~', 'on ~ below', 'next to', etc., one or more other parts may be located between the two parts unless 'directly' or 'directly' is used.

In the case of a description of a temporal relationship, for example, when a temporal precedence relationship is described with 'after', 'after', 'after', 'before', etc., it may include non-continuous cases unless 'immediately' or 'directly' is used.

The term 'at least one' should be understood to include all conceivable combinations from one or more related items. For example, 'at least one of the first item, the second item, and the third item' means not only the first item, the second item, or the third item, but also a combination of all items that can be presented from two or more of the first item, the second item, and the third item.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary diagram showing the configuration of an organic light emitting display device according to the present invention, FIG. 2 is an exemplary diagram showing the configuration of pixels applied to the organic light emitting display device according to the present invention, and FIG. 3 is an exemplary diagram showing the configuration of a control unit applied to the organic light emitting display device according to the present invention.

As shown in FIGS. 1 and 2 , an organic light emitting display device includes an organic light emitting display panel 100 including pixels 110 including organic light emitting diodes (OLEDs) and sensing lines SL1 to SLk connected to the pixels 110, and first to nth data driver ICs 300 that convert sensing values received from the sensing lines into sensing data Sdata and output the output. The control unit 400 transmits test image data to the data driver ICs 300 using a data driver and an Embedded Clock Point to Point Interface (EPI) protocol (hereinafter simply referred to as EPI), and analyzes the sensing data to determine whether the data driver ICs and the sensing data transmission lines (SDTL) receiving the sensing data are normal or not, a power supply unit that supplies power, and gate lines GL1 to G provided in the organic light emitting display panel 100. and a gate driver 200 sequentially supplying gate pulses GP to lg).

Prior to describing the components, the characteristics of the EPI method applied to the organic light emitting display device according to the present invention will be briefly described as follows.

In the organic light emitting display device according to the present invention using the EPI method, the controller 400 individually transmits image data corresponding to each of the at least two data driver ICs 300 to each of the data driver ICs 300.

In addition, when power is supplied to the organic light emitting display device according to the present invention using the EIP method, a lock signal (LOCK) is transmitted from the power supply unit 500 to the first data driver IC (DIC_1), and test image data is transmitted from the control unit 400 to the first data driver IC (DIC_1). When the lock signal LOCK and the test image data are normally received, the first data driver IC (DIC_1) generates a lock signal and transmits it to the second data driver IC.

Each of the 2nd to nth data driver ICs 300 generates a lock signal LOCK when the lock signal LOCK transmitted from the previous data driver IC and the test image data transmitted from the control unit 400 are normally received, and transmits the lock signal LOCK to the data driver IC at the next stage.

The nth data driver IC (DIC_n) also outputs a lock signal (LOCK) by performing the above-described function. The lock signal output from the nth data driver IC (DIC_n) is referred to as a lock result signal (LOCK). The lock result signal LOCK is transmitted to the power supply 500 .

When the lock result signal indicates an error, the power supply unit 500 outputs an error signal to an external system, and when the lock result signal indicates normal, the power supply unit 500 outputs a normal signal to the external system or may not output any signal.

When the error signal is transmitted to the external system, the external system can transmit input image data corresponding to a message related to the occurrence of an error to the controller 400, and accordingly, the organic light emitting display device can output the message.

When the error signal is not transmitted, the normal signal is received, or the period during which no signal is received has elapsed, the external system may transmit the input image data (Ri, Gi, Bi) to the control unit 400, and accordingly, the organic light emitting display device may output an image corresponding to the input image data.

To elaborate, the basic characteristics of the organic light emitting display device according to the present invention using the EPI method are that image data is individually supplied to each of the data driver ICs, and that the normal operation of the data driver ICs is determined using a lock signal (LOCK) before an image is output.

In the organic light emitting display device according to the present invention, the lock signal LOCK is also used as the lock sensing signal LSS. That is, the lock signal (LOCK) and the lock sensing signal (LSS) have similarities in that they are transmitted to the next stage data driver IC and used to determine whether the data driver ICs are normal or not, except that the modes and names are different. Also, in the following description, the lock signals and the lock result signal are represented by the reference numeral LOCK. In addition, when the lock sensing signals are collectively referred to or the lock sensing signals are not specifically limited, the lock sensing signal is represented by reference numeral LSS. However, when it is necessary to indicate a lock sensing signal input to or output from a specific data driver IC, the lock sensing signals may be represented by special reference numerals assigned to each of them, for example, LSS_0, LSS_1, LSS_n, and the like.

In the following, the components are sequentially described.

First, as shown in FIG. 2 , the organic light emitting display panel 100 includes pixels 110 including the organic light emitting diode (OLED) and a pixel driving circuit (PDC). In addition, signal lines defining a pixel area where the pixels 110 are formed and supplying a driving signal to the pixel driving circuit PDC are formed in the organic light emitting display panel 100 .

The signal lines include a gate line GL, a sensing pulse line SPL, a data line DL, a sensing line SL, a first driving power supply line PLA, and a second driving power supply line PLB.

The gate lines GL are formed parallel to each other at regular intervals along the second direction of the organic light emitting display panel 100, for example, the horizontal direction.

The sensing pulse lines SPL may be formed at regular intervals parallel to the gate lines GL.

The data lines DL may be formed parallel to each other at regular intervals along the first direction of the organic light emitting display panel 100, for example, in the vertical direction, to cross each of the gate line GL and the sensing pulse line SPL. However, the arrangement structure of the data line DL and the gate line GL may be variously changed.

The sensing lines SL may be formed at regular intervals parallel to the data lines DL. However, it is not necessarily limited thereto. For example, at least three of the pixels 110 form one unit pixel. In this case, one sensing line SL may be formed in the unit pixel. Accordingly, when the d number of data lines DL1 to DLd are formed on the horizontal line of the organic light emitting display panel 100, the number k of the sensing lines SL may be d/4. The horizontal line is a virtual line formed along the gate line GL, and it can be said that pixels connected to the gate line GL are arranged along the horizontal line. That is, a horizontal line described below may be a virtual line formed by pixels arranged in a row in a horizontal direction of the organic light emitting display panel 100 shown in FIG. 1 .

The first driving power line (PLA) may be formed at regular intervals parallel to the data line (DL) and the sensing line (SL). The first driving power line PLA is connected to the power supply 500 and supplies the first driving power EVDD supplied from the power supply 500 to each pixel 110 .

The second driving power lines PLB supply the second driving power EVSS supplied from the power supply 500 to each pixel 110 .

The pixel driving circuit PDC includes a driving transistor Tdr for controlling current flowing through the organic light emitting diode OLED and a switching transistor Tsw1 connected between the data line DL, the driving transistor Tdr, and the gate line GL. In addition, the pixel driving circuit PDC provided in each of the pixels 110 includes a capacitor Cst and a sensing transistor Tsw2 for external or internal compensation.

The switching transistor Tsw1 is switched by the gate pulse GP and outputs the data voltage Vdata supplied from the data line DL to the gate of the driving transistor Tdr.

The sensing transistor Tsw2 is switched by the sensing pulse SP and supplies the sensing voltage supplied to the sensing line SL to the second node n2 which is the source electrode of the driving transistor Tdr.

The capacitor Cst charges the voltage supplied to the first node n1 according to the switching of the switching transistor Tsw1 and then switches the driving transistor Tdr according to the charged voltage.

The driving transistor Tdr is turned on by the voltage of the capacitor Cst to control the amount of data current Ioled flowing from the first driving power line PLA to the organic light emitting diode OLED.

The organic light emitting diode OLED emits light by the data current Ioled supplied from the driving transistor Tdr and emits light having a luminance corresponding to the data current Ioled.

In the above description, the structure of the pixel 110 having the sensing line SL for performing external compensation or internal compensation has been described with reference to FIG. 2, but the pixel 110 may be formed in various structures including the sensing line SL in addition to the structure shown in FIG.

For example, external compensation means that the amount of change in the threshold voltage or mobility of the driving transistor Tdr formed in the pixel 110 is calculated, and the size of the data voltages supplied to the unit pixel is varied according to the amount of change. Accordingly, the structure of the pixel 110 may be changed in various forms so that the amount of change in the threshold voltage or mobility of the driving transistor Tdr can be calculated. In this case, the sensing line SL must be provided.

In addition, for external compensation, a method of calculating the amount of change in the threshold voltage or mobility of the driving transistor Tdr using the pixel 110 may be variously changed according to the structure of the pixel 110 .

To elaborate, an object of the present invention is to determine whether sensing data transmission lines (SDTL) through which sensing data for compensation generated for external compensation are transmitted are normal, and is not directly related to the external compensation method.

Accordingly, the pixel structure for external compensation and the method for performing the external compensation may be composed of various pixel structures and various external compensation methods that are currently proposed for external compensation. That is, a specific structure of a pixel for performing external compensation and a specific method of external compensation are outside the scope of the present invention. Accordingly, an example of a pixel for extrinsic compensation has been briefly described with reference to FIG. 2, and an extrinsic compensation method is also briefly described below.

Also, the present invention can be applied to an organic light emitting display device including the sensing line SL and the sensing transistor Tsw2 for internal compensation. For internal compensation, the structure of the pixel 110 having the sensing line SL may be changed in various forms, and the internal compensation method may also be variously changed according to the structure of the pixel 110 .

Hereinafter, an organic light emitting display device using external compensation will be described as an example of the present invention.

Second, the gate driver 200 sequentially supplies gate pulses GP to the gate lines GL1 to GLg using the gate control signals GCS transmitted from the controller 400 .

Here, the gate pulse GP means a signal capable of turning on the switching transistor Tsw1 connected to the gate lines GL1 to GLg. A signal capable of turning off the switching transistor Tsw1 is referred to as a gate off signal. The gate pulse GP and the gate off signal are collectively referred to as a gate signal.

The gate driver 200 is formed independently of the organic light emitting display panel 100 and can be connected to the organic light emitting display panel 100 through a tape carrier package (TCP), a chip-on-film (COF), or a flexible printed circuit board (FPCB).

Third, the power supply unit 500 supplies power to the gate driver 200, the data driver, and the control unit 400.

In particular, when a device on signal is received from the external system, the power supply unit 500 transmits a lock signal LOCK having a value corresponding to 1 to the first data driver IC.

In addition, after determining whether the data driver ICs operate normally by the lock signal LOCK, the power supply unit 500 transmits a 0th lock sensing signal LSS_0 having a value corresponding to 1 to the first data driver IC.

A value corresponding to 1 in the above description refers to a value (eg, voltage) capable of outputting 1 during an AND operation. In addition, a value corresponding to 0 in the following description refers to a value (eg, voltage) capable of outputting 0 during the AND operation. For example, a value corresponding to 1 may be a voltage greater than 1V, and a value corresponding to 0 may be a voltage less than 0V or OV.

Fourth, as shown in FIG. 3 , the control unit 400 generates a gate control signal (GCS) for controlling driving of the gate driver 200 and a data control signal (DCS) for controlling driving of the data driver 300, respectively, using a timing synchronization signal (TSS) input from an external system.

Also, in a sensing mode in which sensing for external compensation is performed, the control unit 400 transmits image data for sensing to be supplied to pixels formed on a horizontal line where external compensation is performed to the data driver. Sensing for the external compensation may be performed at various timings.

For example, sensing for external compensation related to changes in the mobility or threshold voltage of the driving transistors Tdr may be performed after an electronic device including an organic light emitting display device according to the present invention is turned on and starts operating, but before an image is output. The electronic device may be, for example, a television, a monitor, a tablet PC, a smart phone, and the like.

Also, the sensing for the external compensation may be performed in a blanking period between frames.

Also, the sensing for the external compensation may be performed in a period from when a device off signal indicating that the electronic device is turned off is received from the external system until the electronic device is turned off.

When the sensing is performed, the control unit 400 calculates external compensation values based on the sensing data for compensation provided from the data driver and stores the external compensation values in the storage unit 450 . The storage unit 450 may be included in the control unit 400 or may be independently formed outside the control unit 400 .

The control unit 400 converts the input image data (Ri, Gi, Bi) transmitted from the external system into externally compensated image data by using the external compensation value during the display period when the image is output, or rearranges the input image data without external compensation and converts the input image data into general image data for output. The data driver IC 300 converts the externally compensated image data or the general image data into data voltages Vdata and supplies the data voltages Vdata to the data lines DL1 to DLd.

The data driver IC 300 generates sensing data (Sdata) related to a characteristic change of the analog-to-digital converter included in the data driver IC 300, in addition to the sensing data for compensation as described above, and transmits it to the control unit 400.

A specific method for generating the sensing data Sdata and the sensing data for compensation will be described in detail with reference to FIG. 7 below.

The sensing data for compensation and the sensing data Sdata are transmitted from the data driver IC 300 to the controller 400 through a sensing data transmission line SDTL connected between the controller 400 and the data driver IC 300.

The sensing data transmission line (SDTL) transmits the sensing data for compensation and the sensing data (Sdata) from the data driver IC 300 to the control unit 400 using Bus Low Voltage Differential Signaling (B-LVDS).

The sensing data transmission line SDTL may include at least one line.

The sensing data transmission line SDTL may be connected between the controller 400 and the data driver IC 300 in a one-to-one manner. In this case, the organic light emitting display device according to the present invention includes a plurality of sensing data transmission lines (SDTL).

Also, one sensing data transmission line (SDTL) may be connected to the data driver ICs 300 and the control unit 400 . In this case, the data driver ICs 300 may sequentially transmit the sensing data Sdata or the sensing data for compensation to the control unit 400 . In this case, since one sensing data transmission line (SDTL) is connected to the data driver ICs 300, it may be considered that the organic light emitting display device according to the present invention includes a plurality of sensing data transmission lines (SDTL).

In order to perform the above functions, as shown in FIG. 3 , the control unit 400 rearranges the input image data Ri, Gi, Bi transmitted from the external system using the timing synchronization signal TSS transmitted from the external system, and supplies the rearranged image data to the data driver IC 300. The gate control signal GCS and the data control signal use the timing synchronization signal TSS. The control signal generation unit 420 for generating DCS, the determination unit 410 for calculating an external compensation value for compensating for the characteristic change of the driving transistor Tdr formed in each of the pixels 110 using the compensation sensing data Sdata transmitted from the data driver IC 300, the image data Data generated by the storage unit 450 for storing the external compensation value, and the data aligning unit 430. An output unit 440 for outputting the control signals DCS and GCS generated by the control signal generator 420 to the data driver IC 300 or the gate driver 200 is included. The storage unit 450 may be included in the control unit 400, but may be configured independently of the control unit 400 as shown in FIG. The data aligning unit 430 may convert the input image data into the image data using the external compensation values.

In particular, the determination unit 410 may analyze the sensing data Sdata to determine whether the data driver ICs are normal and whether the sensing data transmission lines SDTL through which the sensing data Sdata are received are normal.

The determination unit 410 may control the control signal generation unit 420 to generate a lock control signal LCS having a value corresponding to 0 or 1 according to a result of the normality determination.

Under the control of the determination unit 410, the control signal generation unit 420 generates the lock control signals LCS corresponding to each of the data driver ICs 300.

The lock control signals LCS are transmitted to corresponding data driver ICs 300 through the output unit 440 .

Fifth, the data driver includes first through n-th data driver ICs 300 that convert sensing values received from the sensing lines into sensing data Sdata and output the same.

The data driver generates a lock sensing result signal LSRS indicating whether the data driver ICs and the sensing data transmission lines SDTL are normal by using the lock control signal LCS and the zeroth lock sensing signal LSS_0, and transmits the generated lock sensing result signal LSRS to the power supply unit 500.

The configuration of each of the data driver ICs 300 constituting the data driver will be described in detail with reference to FIGS. 4 to 6 below.

4 is an exemplary view showing the configuration of a data driver IC applied to an organic light emitting display device according to the present invention.

The data driver includes first through n-th data driver ICs 300 that convert sensing values received from the sensing lines into sensing data Sdata and output the converted sensing data Sdata.

In this case, FIG. 4 shows one data driver IC 300 among the data driver ICs 300 . The number of sensing lines connected to one data driver IC 300 is smaller than the total number of sensing lines SL1 to SLk connected to the organic light emitting display panel. Therefore, in Fig. 4, s is a natural number smaller than k.

The data driver IC 300 may be included in a chip-on-film 600 attached to the organic light emitting display panel 100 . The chip-on-film 600 is also connected to the main substrate 700 on which the controller 400 is provided. In this case, the chip-on-film 600 includes lines electrically connecting the control unit 400, the data driver IC 300, and the organic light emitting display panel 100. To this end, the lines are electrically connected to pads provided on the main substrate 700 and the organic light emitting display panel 100. However, the data driver IC 300 may be directly mounted on the organic light emitting display panel 100. In this case, the data driver IC 300 may be electrically connected to the main substrate 700 by a flexible film.

The data driver includes at least one data driver IC 300 . Hereinafter, an organic light emitting display device in which the data driver includes the first to nth data driver ICs 300 will be described as an example of the present invention.

Each of the data driver ICs 300 is connected to data lines and the sensing lines, and can operate in an on mode, a sensing mode, a display mode, and an off mode according to a control signal transmitted from the controller 400.

The on mode is a mode for sensing whether the sensing data transfer lines (SDTL) are normal from immediately after the electronic device is turned on until an image is output, the display mode is a mode for outputting an image while the organic light emitting display is being driven, the sensing mode is a mode for sensing the mobility of the driving transistors between display modes, and the off mode is a mode for sensing threshold voltages of the driving transistors performed immediately before the electronic device is turned off. In this case, at least one of the sensing mode and the off mode may be omitted.

Among the above modes, the present invention is particularly directly related to the ON mode.

The on mode can be further divided into a lock check mode for determining whether the data driver ICs are normally operating using the lock signal (LOCK) immediately after the electronic device is turned on and before an image is output, and a transmission line check mode for determining whether the data driver IC 300 or the sensing data transmission line (SDTL) is defective using the lock control signal (LCS) and the lock sensing signals (LSS_0, LSS_1, ..., LSS_n-1, LSS_n). .

That is, in the lock check mode, it can be determined whether the data driver ICs 300 normally operate. However, in the lock check mode, among the components of the data driver ICs 300, in particular, whether the data power supply units 310 related to the reception of image data are judged to be normal or not.

In addition, normal operation of the data driver ICs 300 can be determined even in the transmission line check mode. However, in the transmission line check mode, among the components of the data driver ICs 300, in particular, the normality of the sensing units 320 generating sensing data for compensation may be determined with focus.

However, even in the transmission line check mode, normality of the data power supply units 310 may be determined using test image data.

Accordingly, the lock check mode may be performed independently or integrally performed in the transmission line check mode.

As shown in FIG. 4 , each of the data driver ICs 300 includes a data power supply 310 , a sensing unit 320 and a lock processing unit 330 . The data power supply 310 may be connected to the data lines DL, the sensing unit 320 may be connected to the sensing lines SL, and the lock processing unit 330 may be connected to the power supply 500 and the controller 400.

That is, each of the data driver ICs 300, when a reference voltage supply control signal is received from the data power supply 310 that supplies data voltages Vdata to the data lines DL provided in the organic light emitting display panel 100 and the controller 400, supplies the reference voltage Vref to the sensing lines SL connected to the data driver IC for a predetermined period of time, and when the sensing control signal is received from the controller 400 after the reference voltage is cut off, The sensing unit 320 converts the sensing voltages received from the sensing lines into the sensing data (Sdata), which are digital values, and transmits the data to the control unit, and the lock processing unit 330 performs an AND operation on the 0th lock sensing signal (LSS_0) or the lock sensing signal transmitted from the previous data driver IC with the lock control signal (LCS) transmitted from the control unit 400, and outputs the resultant value.

In the on mode, the data power supply unit 310 may receive the test image data from the control unit 400 and transmit the test image data to the lock processing unit 330, calculate the number of test image data and transmit it to the lock processing unit 330, or transmit a voltage corresponding to the number of test image data to the lock processing unit 330. That is, in the on mode, the data power supply unit 310 may transmit a signal indicating whether the test image data has been normally received to the lock processor 330 .

In the sensing mode, the data power supply unit 310 converts image data for mobility sensing transmitted from the control unit 400 into data voltages to sense changes in the mobility of the driving transistors Tdr, and supplies the data voltages to data lines connected to the data driver IC 300.

The data power supply unit 310 converts the image data Data supplied in units of horizontal lines from the control unit 400 into data voltages and supplies them to the data lines DL for image output in the display mode.

The data power supply 310 converts image data for sensing transmitted from the control unit 400 into data voltages for sensing a threshold voltage in the off mode, and supplies the data voltages to data lines connected to the data driver IC 300.

When the sensing control signal is received from the controller 400 in the on mode, the sensing unit 320 converts the reference voltage Vref into the sensing data Sdata, which is a digital value, and transmits the sensing data Sdata to the controller 400 through the sensing data transmission line SDTL.

In the sensing mode, the sensing unit 320 supplies mobility sensing voltages to sensing lines connected to the sensing unit 320 and then receives signals corresponding to the sensing voltages. The sensing unit 320 converts the signals representing changes in mobilities of the driving transistors Tdr included in the pixels 110 formed on one horizontal line into mobility sensing data that are digital values. The mobility sensing data may be sensing data for compensation. The sensing unit 320 provides the mobility sensing data to the controller 400 through the sensing data transmission line SDTR. In this case, the control unit 400 may calculate an external compensation value using the mobility sensing data.

In the display mode, the sensing unit 320 may supply a voltage necessary for driving the pixel driving circuit PDC to the pixels through the sensing lines SL.

When the sensing control signal is received from the control unit 400 in the off mode, the sensing unit 320 converts the sensing voltages received from the sensing lines into sensing data for compensation that are digital values in order to determine the amount of change in the threshold voltage of the driving transistors, and transmits the sensing data for compensation to the control unit through the sensing data transmission line (SDTL).

FIG. 5 is an exemplary diagram illustrating configurations of a data power supply unit and a sensing unit shown in FIG. 4 .

As described above, when the sensing control signal SAM is received from the control unit 400 in the on mode, the sensing unit 320 converts the sensing voltages received from the sensing lines SL into the sensing data Sdata, which are digital values, and transmits the sensing data Sdata to the control unit 400 through the sensing data transmission line SDTL.

As shown in FIG. 5 , the sensing unit 320 includes a plurality of sensing processing units 320a.

Each of the sensing processors 320a converts the reference voltage Vref into the sensing data Sdata and transmits it to the control unit 400 .

To this end, each of the sensing processors 320a is connected to one of the sensing lines SL1 to SLk, is connected between a first switch 322 turned on or off according to the sensing control signal SAM, the sensing line SL to which the first switch 322 is connected, and a power supply 500 that supplies the reference voltage Vref, and is turned on according to the reference voltage supply control signal SPRE. Alternatively, a second switch 323 that is turned off is connected between the controller 400 and the first switch 322, and the sensing voltage received through the first switch 322 is converted into the sensing data Sdata and an analog-to-digital converter 321 for transmitting to the controller 400.

The first switch 322 and the second switch 323 may be formed of thin film transistors.

In this case, in the on mode, the sensing control signal SAM may be supplied to the gate of the thin film transistor constituting the first switch 322, and the reference voltage supply control signal SPRE may be supplied to the gate of the thin film transistor constituting the second switch 323. The sensing control signal SAM and the reference voltage supply control signal SPRE are data control signals DCS transmitted from the control signal generator 420 of the controller 400 .

The first switch 322 and the second switch 323 can be turned on or off by various control signals even in the sensing mode, and the analog-to-digital converter 321 converts the mobility sensing voltage transmitted from the first switch 322 into mobility sensing data and transmits it to the control unit 400. As described above, the mobility sensing data may be the sensing data for compensation. The mobility sensing data generated in the sensing mode may be used to determine a change in mobility of the driving transistor Tdr. That is, the mobility sensing data generated from the data driver IC 300 in the sensing mode is used to determine the amount of change in mobility.

The first switch 322 and the second switch 323 can be turned on or off by various control signals even in the off mode. The sensing data for compensation generated from the data driver IC 300 in the off mode may be used to determine the amount of change in the threshold voltage of the driving transistor Tdr.

The first switch 322 and the second switch 323 can be turned on or off by various control signals even in the display mode, and various voltages supplied from the power supply unit 500 can be supplied to the sensing line SL through the second switch 323.

6 is an exemplary view showing the configuration of the lock processing unit shown in FIG. 4 .

The lock processing unit 330 calculates the logical product of the 0th lock sensing signal LSS_0 or the lock sensing signal transmitted from the previous data driver IC with the lock control signal LCS transmitted from the controller 400, and outputs the resultant value.

To this end, the lock processing unit 330, as shown in FIG. 6, may include an AND gate 331 that performs the logical AND operation.

The first terminal 333 of the AND gate 331 may be connected to the power supply unit 500 or the previous data driver IC, and the second terminal 334 of the AND gate 331 may be connected to the controller 400.

Accordingly, in the on mode, particularly in the transmission line check mode, the first terminal 333 of the AND gate 331 of the first data driver IC (DIC_1) receives the 0th lock sensing signal (LSS_0) output from the power supply unit 500, and the first terminal 333 of the AND gate 331 of the remaining data driver ICs except the first data driver IC (DIC_1) receives the data driver ICs of the previous stage. The lock sensing signal output from is received. That is, the lock sensing signals LSS are supplied to the first terminals 333 of the AND gates 331 of the data driver ICs 300 .

In this case, the lock control signals LCS transmitted from the control unit are supplied to the second terminals 334 of the AND gates 331 of the data driver ICs 300 .

In the transmission line check mode, the lock processing unit 330 may further use the test image data in addition to the lock sensing signals LSS_0 to LSS_n-1 to generate the lock sensing result signal LSRS indicating whether the data driver ICs or the sensing data transmission lines SDTL are normal, and then transmit the lock sensing result signal LSRS to the power supply unit 500.

To this end, an auxiliary AND gate 332 may be connected to the second terminal 334 of the AND gate 331 .

In the transmission line check mode, the first terminal 335 of the auxiliary AND gate 332 may receive a test image data signal TDS including information on whether the test image data is normally received, and the lock control signal LCS may be received through the second terminal 336 of the auxiliary AND gates 332.

The test image data signal TDS may have a value corresponding to 0 or 1.

The test image data signal TDS is a signal indicating that the test image data has been normally received by the data driver IC 300 .

For example, if the test image data transmitted from the controller 400 are normally received by the data driver IC 300, the test image data signal TDS may have a value corresponding to 1, and if the test image data is not normally received by the data driver IC 300, the test image data signal TDS may have a value corresponding to 0.

The test image data signal TDS may be generated by the test image data signal processing unit 337 . The test image data signal processing unit 337 may be included in the lock processing unit 330, may be provided in the data power supply unit 310, or may be provided in the data driver IC 300 independently of the lock processing unit 330 and the data power supply unit 310.

For example, the test image data TD transmitted from the controller 400 may be received by the test image data signal processor 337 through the data power supply 310, or may be directly received from the controller 400 to the test image data signal processor 337. In this case, the test image data signal processor 337 counts the test image data TDs or uses the levels of the test image data TDs to determine whether or not the test image data TDs meet a preset standard.

More specifically, when the control unit 400 supplies the three test image data TDs having a high level to the data driver IC, the test image data signal processing unit 337 determines whether the three test image data TDs or the test image data TDs having a high level are received, and generates the test image data signal TDS having a value corresponding to 0 or 1 according to the determination result.

A method for the test image data signal processing unit 337 to determine whether the test image data is normally received may be variously changed.

The test image data TD may be used even in the lock check mode. That is, each of the data driver ICs 300 may use the lock signal LOCK and the test image data TD to determine whether each of the data driver ICs operates normally.

In the lock check mode, the lock control signal LCS is not considered.

Accordingly, in the lock check mode, when the lock signal LOCK transmitted from the power supply 500 or the lock signal LOCK transmitted from the previous data driver IC 300 is supplied to the first terminal 333 of the AND gate 331, the second terminal 336 of the auxiliary AND gate 332 may receive a lock control signal corresponding to 1.

In addition, in the lock check mode, when the lock signal LOCK transmitted from the power supply 500 or the lock signal LOCK transmitted from the previous data driver IC 300 is supplied to the first terminal 333 of the AND gate 331, the first terminal 335 of the auxiliary AND gate 332 may be directly connected to the second terminal 334 of the AND gate 331. In this case, the lock control signal LCS may not be transmitted to the auxiliary AND gate 332.

That is, when the lock control signal LCS has a value corresponding to 1, the auxiliary AND gate 332 outputs a value corresponding to 0 or 1 according to the test image data signal TDS. Accordingly, the AND gate 332 can output a lock signal corresponding to 0 or 1 based only on the test image data signal TDS and the lock signal LOCK.

In addition, even when the first terminal 335 of the auxiliary AND gate 332 is directly connected to the second terminal 334 of the AND gate 331, the AND gate 332 may output a lock signal corresponding to 0 or 1 by only the test image data signal TDS and the lock signal LOCK.

However, the on mode may consist of only the transmission line check mode. In this case, whether the data driver IC is normally operating and the sensing data transmission line (SDTL) is normally operating may be simultaneously determined by the lock sensing signal (LSS), the lock control signal (LCS), and the test image data (TD).

In this case, the lock processing unit 330 may have a structure as shown in FIG. 6 .

7 is a flowchart illustrating an embodiment of a method of driving an organic light emitting display device according to the present invention.

Hereinafter, a method of determining whether the data driver IC 300 or the sensing data transmission line SDTL is defective in the on mode of the organic light emitting display device according to the present invention will be described with reference to FIGS. 1 to 7 . Among the following descriptions, descriptions identical to or similar to those described above are omitted or simply described.

First, when power is supplied to the electronic device and a signal for driving the electronic device is received, the external system supplies a device-on signal to the control unit 400, and power is also supplied to the organic light emitting display device (702).

Next, when the device-on signal is received, a lock check mode is performed to determine whether the data driver ICs 300 are normally operating using the lock signal LOCK (704).

The purpose of the lock check mode is to check whether image data is normally received from the controller 400 to each of the data driver ICs 300 using the EPI method.

However, the lock check mode 704 may be omitted. If the lock check mode 704 is omitted, the purpose of the lock check mode 704 can be achieved through transmission line check modes 708 to 726 described below.

To elaborate, in the organic light emitting display device according to the present invention, the transmission line check mode may be executed after the lock check mode 704 is executed, or the purpose of the lock check mode 704 may be achieved in the transmission line check mode.

Hereinafter, an organic light emitting display device in which the lock check mode 704 is independently performed will be described as an example of the present invention.

When the device on signal is received from the external system (702), the controller 400 transmits the test image data TD to each of the data driver ICs. The test image data TD may be stored in the storage unit 450 .

The power supply unit 500 generates a lock signal LOCK under the control of the control unit 400, according to the device on signal, or according to a separate control signal transmitted from the external system, and transmits it to the first driver IC DIC_1.

The data driver uses the test image data TD and the lock signal LOCK to generate a lock result signal LOCK_R indicating whether the test image data TD are normally received by the data driver IC 300, and then transmits the lock result signal LCOK_R to the power supply 500. If the lock result signal LCOK_R is normal, the controller 400 drives the data driver to receive sensing data Sdata (706).

For example, the lock processing unit 330 of the first data driver IC (DIC_1) generates a lock signal by performing an AND operation on the lock signal (LOCK) transmitted from the power supply unit 500 through the first terminal 333 of the AND gate 331 and a test image data signal (TDS) including information on whether the test image data transmitted from the control unit 400 is normally received. The test image data signal TDS is generated by the test image data signal processor 337 included in the first data driver IC and received through the second terminal 334 of the AND gate 331 .

The lock processing unit 330 of the second data driver IC generates a lock signal by performing an AND operation on the lock signal transmitted from the first data driver IC (DIC_1) through the first terminal 333 of the AND gate 331 and the test image data signal TDS, which includes information on whether the test image data transmitted from the control unit 400 is normally received. The test image data signal TDS is generated by the test image data signal processor 337 included in the second data driver IC and received through the second terminal 334 of the AND gate 331 .

The lock processing unit 330 of the n-th data driver IC DIC_n generates a lock result signal LOCK_R by performing an AND operation on a lock signal transmitted from the n−1-th data driver IC through the first terminal 333 of the AND gate 331 and a test image data signal TDS including information on whether the test image data transmitted from the control unit 400 is normally received. The test image data signal TDS is generated by the test image data signal processor 337 included in the n-th data driver IC DIC_n and received through the second terminal 334 of the AND gate 331.

When the lock result signal LOCK_R indicates an error, the power supply 500 outputs an error signal FS to the external system. When the lock result signal LOCK_R indicates normal, the power supply unit 500 may output a normal signal to the external system or may not output any signal.

When the error signal FS is transmitted to the external system, the external system can transmit input image data corresponding to a message related to the occurrence of an error to the controller 400, and accordingly, the organic light emitting display device can output the message. In this case, the input image data corresponding to the message may be stored in the storage unit 450, and the external system may transmit a signal to output the message to the control unit 400.

The transmission of the error signal means that the test image data TD was not normally received by at least one of the data driver ICs.

That is, in a defective data driver IC in which the test image data TD is not normally received, the test image data signal TDS has a value corresponding to 0, and thus, the lock signal LOCK output from the defective data driver IC has a value corresponding to 0. In data driver ICs subsequent to the defective data driver IC, a lock signal corresponding to 0 is received. Accordingly, data driver ICs after the defective data driver IC output a lock signal corresponding to 0, regardless of whether the test image data TD are normally received.

Accordingly, the nth data driver IC DIC_n also outputs a lock signal corresponding to 0 as the lock result signal LOCK_R.

In this case, the organic light emitting display device may output the message so that the user requests an after-sales service (AS) or the like.

When the error signal FS is not transmitted to the external system, the normal signal is received by the external system, or the period in which no signal is received elapses a predetermined period, the external system may transmit a signal indicating that the data driver ICs are normally driven to the controller 400.

When a signal indicating that the data driver ICs are normally driven is received from the external system to the control unit 400, when a period in which the error signal is not received from the power supply unit 500 to the control unit 400 elapses a predetermined period, or when a signal indicating that the data driver ICs are normally driven is received from the power supply unit 400, the control unit 400 determines that the lock result signal LCOK_R is normal.

In this case, the control unit 400 drives the data driver to execute the transmission line check mode.

Next, when the transmission line check mode is executed, the controller 400 transmits the reference voltage supply control signal SPRE to each of the data driver ICs. When the reference voltage supply control signal SPRE is received from the control unit 400, each of the data driver ICs receives the reference voltages Vref from the power supply unit 500, converts the reference voltages into the sensing data Sdata, and transmits the sensing data Sdata to the control unit 400 through the sensing data transmission line SDTL (706).

That is, when the transmission line check mode is executed, the controller 400 transmits the reference voltage supply control signal SPRE to the sensing unit 320 of each of the data driver ICs.

The second switches 323 provided in each of the sensing processors 320a of the sensing unit 320 are turned on by the reference voltage supply control signal SPRE, and accordingly, the reference voltages Vref are supplied through the second switches 323.

When a predetermined period elapses after the reference voltages Vref are supplied through the second switches 323, the control unit 400 transmits the sensing control signal SAM to the first switches 321 provided in each of the sensing processing units 320a.

The first switches 321 are turned on by the sensing control signal SAM, and thus, the reference voltages Vref are transmitted to the analog-to-digital converters 321 .

If the analog-to-digital converters 321 are normally driven, the sensing data Sdata generated by the analog-to-digital converters 321 have values smaller than a preset threshold value.

If the sensing data Sdata has a value smaller than the threshold value and the sensing data transmission line SDTL through which the sensing data Sdata is transmitted is normal, the sensing data Sdata received by the controller 400 have normal values smaller than the threshold value. This means that the data driver IC and the sensing data transmission line (SDTL) are normal. The threshold value may be variously set in consideration of the characteristics of the data driver IC 300 and the analog-to-digital converter 321 .

However, if an error occurs in at least one of the analog-to-digital converters 321 or a defect occurs in the sensing data transmission line SDTL, at least one of the sensing data Sdata received by the controller 400 has a value greater than the threshold value. This means that a defect occurs in at least one of the data driver IC or the sensing data transmission line SDTL.

Next, when the sensing data Sdata is received from each of the data driver ICs, the control unit 400 determines whether each of the data driver ICs is normal and whether each of the sensing data transmission lines (SDTL) connected to the data driver ICs is normal by using whether or not the sensing data Sdata is normal (708). According to the determination result, the controller 400 transmits the lock control signal LCS to each of the data driver ICs (710 and 712).

That is, the controller 400 determines whether all of the sensing data Sdata are normal (708).

To this end, as described above, the control unit 400 compares the sensing data Sdata transmitted from the data driver ICs through the sensing data transmission lines SDTL with the threshold value, and determines whether there is sensing data exceeding the threshold value.

As a result of the determination (708), if sensing data exceeding the threshold is detected, the control unit 400 transmits a lock control signal (LCS) having a value corresponding to 0 to the data driver IC that has transmitted the sensing data exceeding the threshold (710).

However, as a result of the determination (708), a lock control signal (LCS) having a value corresponding to 1 is transmitted to the data driver IC that has transmitted sensing data that does not exceed the threshold (712).

That is, the lock control signal LCS is individually generated for each of the data driver ICs.

To elaborate, if all of the sensing data received from the first data driver IC (SDI_1) does not exceed the threshold, a lock control signal (LCS) having a value corresponding to 1 is transmitted to the first data driver IC (SDI_1) (710).

However, if there is sensing data exceeding the threshold among the sensing data received from the k-th data driver IC, a lock control signal LCS having a value corresponding to 0 is transmitted to the k-th data driver IC (712). Here, n is a natural number greater than or equal to 2, and k is a natural number smaller than n.

Next, among the data driver ICs DIC_1 to DIC_n, a data driver IC provided at one end of the organic light emitting display panel, for example, a first data driver IC (SDI_1) provided at the left end of the organic light emitting display panel as shown in FIG. is calculated to generate a first lock sensing signal LSS_1 (714, 716). The 0th lock sensing signal LSS_0 is received from the power supply 500 like the lock signal LOCK, and performs a function similar to that of the lock signal LOCK.

That is, the 0th lock sensing signal (LSS_0) to the n-1st lock sensing signal (LSS_n-1) are signals transmitted to the next-stage data driver IC to inform whether the data driver ICs are normal or not, and the lock signal (LOCK) is also transmitted to the next-stage data driver IC and signals to inform whether the data driver ICs are normal or not. Accordingly, in the present invention, the lock signal LOCK may be used as the sensing signal LSS.

In this case, the first data driver IC (SDI_1) generates the first lock sensing signal LSS_1 by performing an AND operation on the 0th lock sensing signal LSS_0 having a value corresponding to 1 and the lock control signal LCS having a value corresponding to 0 or 1 transmitted from the control unit 400 (714, 716).

That is, since the first data driver IC (SDI_1) does not have the lock sensing signal (LSS) transmitted from the previous data driver IC, the 0th lock sensing signal (LSS_0) is supplied to the first data driver IC (SDI_1) from the power supply unit 500.

The power supply unit 500 may generate the 0th lock sensing signal LSS_0 according to a control signal from the control unit 400, a control signal transmitted from the external system, or a control signal transmitted from at least one of the data driver ICs, and transmit the 0th lock sensing signal LSS_0 to the first data driver IC SDI_1.

Since the 0th lock sensing signal LSS_0 has a value corresponding to 1, when the lock control signal LCS transmitted from the controller 400 has a value corresponding to 0, the first data driver IC SDI_1 transmits the first lock sensing signal LSS_1 having a value corresponding to 0 to the second data driver IC (716, 718).

However, when the lock control signal (LCS) transmitted to the first data driver IC (SDI_1) has a value corresponding to 1, the first data driver IC (SDI_1) transmits the first lock sensing signal (LSS_1) having a value corresponding to 1 to the second data driver IC (718, 720).

Next, since the second data driver IC is not the last data driver IC (722), the second data driver IC generates a second lock sensing signal by performing an AND operation on the first lock sensing signal (LSS_1) and the lock control signal transmitted from the controller and having a value corresponding to 0 or 1 (714 to 720).

The second lock sensing signal may be transmitted to a next stage data driver IC, that is, a third data driver IC.

Next, the n−1 th lock sensing signal LSS_n−1 generated by the n_1 th data driver IC using the methods described above is transmitted to the n th data driver IC DIC_n.

The nth data driver IC (DIC_n) is the last data driver IC (722).

Like the previous data driver ICs, the n-th data driver IC generates an n-th lock sensing signal by performing an AND operation on the n-1-th lock sensing signal LSS_n-1 transmitted from the n-1-th data driver IC and the lock control signal transmitted from the control unit and having a value corresponding to 0 or 1.

The nth lock sensing signal is a lock sensing result signal LSRS.

That is, the nth data driver IC DIC_n generates a lock sensing result signal LSRS and transmits the lock sensing result signal LSRS to the power supply unit 500 (724).

Next, the power supply unit 500 may perform an operation similar to the operation method according to the lock result signal LOCK_R.

That is, when the lock sensing result signal LSRS indicates an error, the power supply unit 500 may output an error signal FS to the external system (726).

In the transmission line check mode, as described with reference to FIG. 6 , the data driver may further use the test image data TD to generate the lock sensing result signal LSRS indicating whether the data driver ICs or the sensing data transmission lines SDTL through which the sensing data is received are normal or not, and transmit it to the power supply unit 500.

In this case, since it can also be determined whether the data driver ICs have normally received the test image data TD, the lock check mode may not be performed.

However, even after the lock check mode is performed, in the transmission line check mode, the data driver may further use the test image data TD to generate the lock sensing result signal LSRS indicating whether the data driver ICs or the sensing data transmission lines SDTL through which the sensing data are received are normal or not, and transmit the generated lock sensing result signal LSRS to the power supply unit 500.

Finally, when it is determined that the data driver ICs and the sensing data transmission lines are normal according to the lock sensing result signal LSRS, the controller 400 executes the display mode and the sensing mode.

For example, according to the lock sensing result signal LSRS, a signal indicating that the data driver ICs and the sensing data transmission lines are normally operating is received by the control unit 400 from the external system, a period in which the error signal FS is not received from the power supply unit 500 to the control unit 400 passes a predetermined period of time, or a signal indicating that the data driver ICs and the sensing data transmission lines are normally driven from the power supply unit 400 When is received, the controller 400 determines that the lock sensing result signal LSRS is normal.

In this case, the controller 400 executes the display mode and the sensing mode.

That is, in the sensing mode, the controller 400 drives the data driver ICs to sense the mobilities of the driving transistors included in the pixels, and calculates compensation values to be applied to the pixels using sensing data for compensation received from lines to which the sensing data is transmitted by the sensing.

In the display mode, the controller 400 converts the input image data transmitted from the external system into image data using the compensation values, and transmits the image data to the data driver ICs.

The data driver ICs 300 convert the image data into data voltages and transmit them to data lines provided in the organic light emitting display panel in the display mode. Accordingly, images corresponding to the input image data are output from the organic light emitting display panel 100 .

Those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims to be described later rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present invention.

100: organic light emitting display panel 200: gate driver
300: data driver IC 400: timing controller
110: pixel 500: power supply unit

Claims (14)

an organic light emitting display panel including pixels including organic light emitting diodes and sensing lines connected to the pixels;
a data driver including first through n-th data driver ICs that convert sensing values received from the sensing lines into sensing data and output the converted sensing data;
A controller that transmits test image data to the data driver ICs using an embedded clock point-to-point interface protocol, analyzes the sensing data, and determines whether the data driver ICs and sensing data transmission lines connected to the data driver ICs receive the sensing data are normal; and
Including a power supply for supplying power,
The control unit transmits a lock control signal having a value corresponding to 0 or 1 to each of the data driver ICs according to a result of the normality determination;
The power supply unit transmits a 0th lock sensing signal having a value corresponding to 1 to the first data driver IC;
The data driver calculates the logical product of the lock control signal and the zeroth lock sensing signal to generate a lock sensing result signal indicating whether the data driver ICs and the sensing data transmission lines connected to the data driver ICs receive the sensing data are normal or not, and transmits the signal to the power supply unit.
wherein the power supply unit outputs an error signal to an external system when the lock sensing result signal transmitted from the data driver indicates an error. According to claim 1,
When a reference voltage supply control signal is received from the control unit, each of the data driver ICs receives reference voltages from the power supply unit, converts the reference voltages into the sensing data, and transmits the sensing data to the control unit through the sensing data transmission line. According to claim 1,
The sensing data is received from each of the data driver ICs,
The controller uses the sensing data to determine whether each of the data driver ICs is normal and whether each of the sensing data transmission lines connected to the data driver ICs is normal.
The control unit transmits the lock control signal to each of the data driver ICs according to the determination result. According to claim 3,
The control unit transmits a lock control signal corresponding to 0 to a data driver IC that has transmitted sensing data exceeding a predetermined threshold, and transmits a lock control signal corresponding to 1 to a data driver IC that has transmitted sensing data that does not exceed a predetermined threshold. According to claim 1,
The first data driver IC generates a first lock sensing signal by performing a logical product operation of the 0th lock sensing signal transmitted from the power supply unit and the lock control signal transmitted from the control unit;
The second data driver IC generates a second lock sensing signal by performing an AND operation on the first lock sensing signal and the lock control signal transmitted from the control unit;
The n-th data driver IC generates a lock sensing result signal by performing an AND operation on the n-1-th lock sensing signal transmitted from the n-1-th data driver IC and the lock control signal transmitted from the control unit;
The organic light emitting display device of claim 1 , wherein the power supply unit outputs an error signal to an external system when the lock sensing result signal indicates an error. According to claim 5,
The first data driver IC generates the first lock sensing signal by performing an AND operation on the 0th lock sensing signal containing information corresponding to 1 and the lock control signal transmitted from the control unit and corresponding to 0 or 1;
The second data driver IC generates the second lock sensing signal by performing an AND operation on the first lock sensing signal and the lock control signal transmitted from the control unit and corresponding to 0 or 1;
wherein the n-th data driver IC calculates a logical product of the n-1-th lock sensing signal and the lock control signal transmitted from the control unit and corresponds to 0 or 1 to generate the lock sensing result signal. According to claim 1,
The data driver further uses the test image data to generate the lock sensing result signal indicating whether the data driver ICs or the sensing data transmission lines receiving the sensing data are normal, and transmits the signal to the power supply unit. According to claim 1,
When a device on signal is received from an external system, the control unit transmits the test image data to each of the data driver ICs;
The power supply unit transmits a lock signal to the first data driver IC;
The data driver generates a lock result signal indicating whether the test image data are normally received by the data driver ICs using the test image data and the lock signal, and transmits it to the power supply unit;
If the lock result signal is normal, the control unit drives the data driver to receive the sensing data. According to claim 8,
The first data driver IC generates a lock signal by performing an AND operation on the lock signal transmitted from the power supply unit and a test image data signal including information on whether the test image data transmitted from the control unit is normally received,
The second data driver IC generates a lock signal by performing an AND operation on the lock signal transmitted from the first data driver IC and a test image data signal including information on whether the test image data transmitted from the controller is normally received,
The n-th data driver IC generates a lock result signal by performing an AND operation on a lock signal transmitted from the n-1th data driver IC and a test image data signal including information on whether the test image data transmitted from the control unit is normally received,
The organic light emitting display device of claim 1 , wherein the power supply unit outputs an error signal to an external system when the lock result signal indicates an error. According to claim 1,
If it is determined that the data driver ICs and the sensing data transmission lines are normal according to the lock sensing result signal, the controller drives the data driver ICs to sense mobility of the driving transistors included in the pixels, and calculates compensation values to be applied to the pixels using the sensing data for compensation received from the sensing data transmission lines by the sensing;
The control unit converts input image data transmitted from an external system into image data using the compensation values, and transmits the image data to the data driver ICs;
The data driver ICs convert the image data into data voltages and transmit them to data lines provided in the organic light emitting display panel. According to claim 1,
Each of the data driver ICs,
a data power supply supplying data voltages to data lines provided in the organic light emitting display panel;
When a reference voltage supply control signal is received from the control unit, the reference voltages are supplied to sensing lines connected to the data driver IC for a predetermined period of time, and when a sensing control signal is received from the control unit after the reference voltage is cut off, a sensing unit converts the sensing voltages received from the sensing lines into the sensing data that are digital values and transmits the data to the control unit; and
and a lock processing unit configured to perform an AND operation on the lock sensing signal transmitted from the zeroth lock sensing signal or a previous data driver IC and the lock control signal transmitted from the controller and output a resultant value. According to claim 11,
The lock processing unit includes an AND gate that performs the AND operation,
A first terminal of the AND gate is connected to the power supply unit or a previous data driver IC,
A second terminal of the AND gate is connected to the controller. According to claim 12,
An auxiliary AND gate is connected to the second terminal,
A test image data signal including information on whether the test image data is normally received is received through a first terminal of the auxiliary AND gate;
A lock control signal is received through a second terminal of the auxiliary AND gate. According to claim 13,
When a lock signal transmitted from the power supply unit or a lock signal transmitted from a previous stage data driver IC is supplied to the first terminal of the AND gate, a lock control signal corresponding to 1 is received to the second terminal of the auxiliary AND gate.

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